Based upon the limited amount of information that you've supplied, I am not sure that I will be able to answer your question in much detail, unfortunately. However, if you are menstruating more or less regularly, then your ovaries should be functional, and you should have developed female breasts by age 21 (although some degree of breast development may continue beyond your current age).
As I'm sure that you already know, there is tremendous variability in breast size and shape among individual women. If your concern is that you have developed breasts, but they are too small, then it is unlikely that you will experience a sudden "growth spurt" in breast development that will result in much larger breasts.
On the other hand, if you have experienced absolutely no breast growth whatsoever since puberty, despite menstruating normally, then there may be some cause for concern about possible arrested breast development (since you didn't mention it, I am assuming that you did not undergo radiation treatments to the chest area, or bilateral breast surgery, and that you did not experience any injuries to your breasts, prior to puberty). If you truly have experienced absolutely no breast development whatsoever, then you might consider a consultation with an Endocrinologist.
Sincerely/ Robert A. Wascher, MD, FACS
http://doctorwascher.com
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